The Unexpected Ingredient That Will Majorly Upgrade Your Spinach Quiche

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Caramelized onion is a key ingredient in many dishes and it's easy to see why. When onions are slow-cooked in butter or oil over low heat, they become sweet and rich, adding depth of flavor to any dish. This simple ingredient can transform your spinach quiche from good to great.

Dietitian nutritionist and Mashed recipe developer Mackenzie Burgess shared her recipe for a succulent caramelized onion and spinach quiche, emphasizing the need to cook the onions slowly in order to achieve the perfect flavor.

"You typically won't start to see the browning occur until 8-10 minutes into the cooking process," Burgess says, "so be patient. The extra flavor here is so worth it!"

If you're cooking a big brunch and running short on free hands, a relatively hands-off hack for easily caramelizing your onions is to place them on a baking sheet and pop them in the oven. Simply toss the onions in a bit of oil, water, and salt, and they'll caramelize over the course of 40-50 minutes with just the occasional stirring. They can then be added to your spinach mixture for your quiche.

Whether you're looking for something special to impress your guests, or just want a tasty way to sneak more veggies into your diet, this extra ingredient is sure to upgrade your spinach quiche. So don't be afraid to add some caramelized onions the next time you make this delicious and versatile dish.